breaking(Build): Remove the IE11 polyfills-loader.

Clear out the polyfills-loader script but keep the module for backwards compatibility.
No IE11 compatibility polufills are included anymore as support for IE11 has recently really and finally dropped.

Author: thet

package.json

@@ -12,13 +12,11 @@
         "@fullcalendar/list": "^5.11.3",
         "@fullcalendar/luxon2": "^5.11.3",
         "@fullcalendar/timegrid": "^5.11.3",
-        "@juggle/resize-observer": "^3.4.0",
         "@stomp/stompjs": "^6.1.2",
         "dompurify": "^2.4.1",
         "google-code-prettify": "^1.0.5",
         "highlight.js": "<11",
         "imagesloaded": "^4.1.4",
-        "intersection-observer": "^0.12.2",
         "jquery": "^3.6.1",
         "jquery-jcrop": "^0.9.13",
         "luxon": "2.4.0",
@@ -30,17 +28,14 @@
         "pikaday": "^1.8.0",
         "prettier": "^2.7.1",
         "prismjs": "^1.29.0",
-        "promise-polyfill": "^8.2.3",
         "screenfull": "^6.0.2",
         "select2": "^3.5.1",
         "showdown": "^2.1.0",
         "showdown-prettify": "^1.3.0",
         "slick-carousel": "^1.8.1",
         "slides": "git+https://github.com/Patternslib/slides.git",
         "spectrum-colorpicker": "^1.8.0",
-        "tippy.js": "^6.3.7",
-        "url-polyfill": "^1.1.9",
-        "whatwg-fetch": "^3.4.0"
+        "tippy.js": "^6.3.7"
     },
     "devDependencies": {
         "@patternslib/dev": "^3.1.2",

src/polyfills-loader.js

@@ -1,26 +1 @@
-var script_source = function () {
-    // See: https://stackoverflow.com/a/984656/1337474
-    var scripts = document.getElementsByTagName("script");
-    var script = scripts[scripts.length - 1];
-
-    if (script.getAttribute.length !== undefined) {
-        return script.src;
-    }
-
-    // Some IE quirks
-    return script.getAttribute("src", -1);
-};
-
-(function () {
-    // https://stackoverflow.com/a/8578840/1337474
-    // if IE
-    if (/*@cc_on!@*/ false || !!document.documentMode) {
-        var script_url = script_source();
-        script_url = script_url.substring(0, script_url.lastIndexOf("/")) + "/";
-
-        var script_tag = document.createElement("script");
-        script_tag.type = "text/javascript";
-        script_tag.src = script_url + "bundle-polyfills.min.js";
-        document.getElementsByTagName("head")[0].appendChild(script_tag);
-    }
-})();
+// BBB backwards compatibility

src/polyfills.js

@@ -1,69 +0,0 @@
-// Polyfills for older browsers, most notably IE11.
-//
-// Use polyfills-loader.js before the Patternslib bundle to conditionally load
-// the polyfills for Internet Explorer:
-//
-//     <script src="polyfills-loader.js" type="text/javascript"></script>
-
-// Core JS features
-// You can also import individual core-js features:
-//     import "core-js/stable/object/assign";
-// But we're importing them all:
-import "core-js/stable";
-
-// Web APIs
-import "intersection-observer";
-import "promise-polyfill/src/polyfill";
-import "url-polyfill";
-import "whatwg-fetch";
-import { ResizeObserver as ResizeObserverPolyfill } from "@juggle/resize-observer";
-
-if ("ResizeObserver" in window === false) {
-    window.ResizeObserver = ResizeObserverPolyfill;
-}
-
-// Node.closest polyfill
-// https://developer.mozilla.org/en-US/docs/Web/API/Element/closest#polyfill
-if (!Element.prototype.matches) {
-    Element.prototype.matches =
-        Element.prototype.msMatchesSelector || Element.prototype.webkitMatchesSelector;
-}
-if (!Element.prototype.closest) {
-    Element.prototype.closest = function (s) {
-        var el = this;
-        do {
-            if (Element.prototype.matches.call(el, s)) return el;
-            el = el.parentElement || el.parentNode;
-        } while (el !== null && el.nodeType === 1);
-        return null;
-    };
-}
-// END Node.closest polyfill
-
-if (!document.currentScript) {
-    var scripts = document.getElementsByTagName("script");
-    document.currentScript = scripts.length && scripts[scripts.length - 1];
-}
-
-// Node.remove polyfill
-// From: https://developer.mozilla.org/en-US/docs/Web/API/ChildNode/remove#polyfill
-// From: https://github.com/jserz/js_piece/blob/master/DOM/ChildNode/remove()/remove().md
-(function (arr) {
-    arr.forEach(function (item) {
-        // eslint-disable-next-line no-prototype-builtins
-        if (item.hasOwnProperty("remove")) {
-            return;
-        }
-        Object.defineProperty(item, "remove", {
-            configurable: true,
-            enumerable: true,
-            writable: true,
-            value: function remove() {
-                this.parentNode.removeChild(this);
-            },
-        });
-    });
-})([Element.prototype, CharacterData.prototype, DocumentType.prototype]);
-// END Node.remove polyfill
-
-// input.labels polyfill